Sign in Share More Report Need to report the video? Rett McBride 6,562 views 5:31 Margin of Error Example - Duration: 11:04. About Today Living Healthy Statistics You might also enjoy: Health Tip of the Day Recipe of the Day Sign up There was an error. What Is a Confidence Interval?

Sign in 8 Loading... Here are the steps for calculating the margin of error for a sample proportion: Find the sample size, n, and the sample proportion. It can be estimated from just p and the sample size, n, if n is small relative to the population size, using the following formula:[5] Standard error ≈ p ( 1 The greater the level of confidence, the higher the critical value will be.

Loading... Sign in to make your opinion count. Mahwah, NJ: Lawrence Erlbaum Associates. ^ Drum, Kevin. Typically, you want to be about 95% confident, so the basic rule is to add or subtract about 2 standard errors (1.96, to be exact) to get the MOE (you get

However, confidence intervals and margins of error reflect the fact that there is room for error, so although 95% or 98% confidence with a 2 percent Margin of Error might sound If you aren't sure, see: T-score vs z-score. In other words, the margin of error is half the width of the confidence interval. A sample proportion is the decimal version of the sample percentage.

All Rights Reserved. Note that there is not necessarily a strict connection between the true confidence interval, and the true standard error. Retrieved 2006-05-31. In the bottom portion, each line segment shows the 95% confidence interval of a sampling (with the margin of error on the left, and unbiased samples on the right).

Red River College Wise Guys 76,918 views 8:46 How to calculate margin of error and standard deviation - Duration: 6:42. p.64. Brandon Foltz 87,111 views 37:42 How to calculate Confidence Intervals and Margin of Error - Duration: 6:44. This theory and some Bayesian assumptions suggest that the "true" percentage will probably be fairly close to 47%.

Loading... The margin of error for a particular sampling method is essentially the same regardless of whether the population of interest is the size of a school, city, state, or country, as Pacific Grove, California: Duxbury Press. Please select a newsletter.

How to Compute the Margin of Error The margin of error can be defined by either of the following equations. We will plan for the worst case possible, in which we have no idea what the true level of support is the issues in our poll. Home Tables Binomial Distribution Table F Table PPMC Critical Values T-Distribution Table (One Tail) T-Distribution Table (Two Tails) Chi Squared Table (Right Tail) Z-Table (Left of Curve) Z-table (Right of Curve) Thank you,,for signing up!

Share Pin Tweet Submit Stumble Post Share By Courtney Taylor Statistics Expert By Courtney Taylor Many times political polls and other applications of statistics state their results with a margin of The true standard error of the statistic is the square root of the true sampling variance of the statistic. Along with the confidence level, the sample design for a survey, and in particular its sample size, determines the magnitude of the margin of error. Close Yeah, keep it Undo Close This video is unavailable.

This margin of error calculator makes it simple. Show more Language: English Content location: United States Restricted Mode: Off History Help Loading... Statisticshowto.com Apply for $2000 in Scholarship Money As part of our commitment to education, we're giving away $2000 in scholarships to StatisticsHowTo.com visitors. Loading...

Two conditions need to be met in order to use a z*-value in the formula for the margin of error for a sample proportion: You need to be sure that is

Retrieved 2006-05-31. The size of the sample was 1,013.[2] Unless otherwise stated, the remainder of this article uses a 95% level of confidence. and R.J. Along with the confidence level, the sample design for a survey, and in particular its sample size, determines the magnitude of the margin of error. Thank you,,for signing up! The terms statistical tie and statistical dead heat are sometimes used to describe reported percentages that differ by less than a margin of error, but these t...

Add your answer Source Submit Cancel Report Abuse I think this question violates the Community Guidelines Chat or rant, adult content, spam, insulting other members,show more I think this question violates Stats 160 Final Review #1 mcstutoringstats SubscribeSubscribedUnsubscribe358358 Loading... The condition you need to meet in order to use a z*-value in the margin of error formula for a sample mean is either: 1) The original population has a normal I've found both of those things before on ...

Otherwise, look at the more advanced books. Mahwah, NJ: Lawrence Erlbaum Associates. ^ Drum, Kevin. The general formula for the margin of error for a sample proportion (if certain conditions are met) is where is the sample proportion, n is the sample size, and z* is Of these three the 95% level is used most frequently.If we subtract the level of confidence from one, then we will obtain the value of alpha, written as ?, needed for When a single, global margin of error is reported for a...